"Ben's longtime enemies, the Forever Knights, have uncovered a highly unusual alien artifact - one that can strip Ben of all his powers. Ben, Gwen, and Kevin are determined to investigate. After all, they can't let something this dangerous fall into the wrong hands. Their quest leads them to the Forever King, a bold new leader with a terrifying vision. Can the three teens stop him? Or are they falling straight into a trap?"-- Cover p. [4].